Organisation Internationale de Métrologie Légale. Direct mass flow measuring systems for quantities of liquids

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1 Organisation Internationale de Métrologie Légale OIML INTERNATIONAL RECOMMENDATION Direct mass flow measuring systems for quantities of liquids Ensembles de mesurage massiques directs de quantités de liquides OIML R 105 Edition 1993 (E)

2 CONTENTS Foreword... 4 Terminology (terms and definitions)... 5 Section I - General 1 Scope, application and terminology Section II - Metrological requirements 2 Rated operating conditions Maximum permissible errors Pattern evaluation Verification Small quantities Repeatability Liquified gases Adjustment means Discontinuous adjustment means Sealing Minimum measured quantity Section III - Technical requirements 6 Indicators Units of measurement Numerical value of scale interval Maximum value of scale interval Values defined Return to zero Nonresettable indicator Presetting device Printer Measuring systems Vapor elimination Maintenance of liquid state Provision for sealing Discharge lines and valves Diversion of measured liquid Directional flow valves Discharge valves Anti-drain means Other valves Markings Section IV - Requirements for electronic measuring systems 11 General requirements for electronic measuring systems Requirements specific to certain electronic devices Measuring transducer Calculator Indicating device Power supply Peripheral equipment

3 13 Checking facilities and durability protection features Action of checking features Checking features for the measuring transducer Checking features for the calculator Checking features for the indicating device Checking features for peripheral equipment Pattern approval Documentation General requirements Equipment under test (EUT) Pattern approval certificate Initial verification Annex A Test procedures: Performance tests - General A.1 Pattern approval tests A.2 Initial and subsequent verification tests Annex B Test procedures: Performance tests applicable to electronic equipment B.1 General B.2 Severity levels B.3 Reference conditions B.4 Performance tests B.4.1 Dry heat B.4.2 Cold B.4.3 Damp heat, cyclic B.4.4 Vibration B.4.5 Power voltage variation B.4.6 Short time power reduction B.4.7 Bursts B.4.8 Electrostatic discharge B.4.9 Electromagnetic susceptibility

4 FOREWORD The International Organization of Legal Metrology (OIML) is a worldwide, intergovernmental organization whose primary aim is to harmonize the regulations and metrological controls applied by the national metrological services, or related organizations, of its Member States. The two main categories of OIML publications are: 1) International Recommendations (OIML R), which are model regulations that establish the metrological characteristics required of certain measuring instruments and which specify methods and equipment for checking their conformity; the OIML Member States shall implement these Recommendations to the greatest possible extent; 2) International Documents (OIML D), which are informative in nature and intended to improve the work of the metrological services. OIML Draft Recommendations and Documents are developed by technical committees or subcommittees which are formed by the Member States. Certain international and regional institutions also participate on a consultation basis. Cooperative agreements are established between OIML and certain institutions, such as ISO and IEC, with the objective of avoiding contradictory requirements; consequently, manufacturers and users of measuring instruments, test laboratories, etc. may apply simultaneously OIML publications and those of other institutions. International Recommendations and International Documents are published in French (F) and English (E) and are subject to periodic revision. OIML publications may be obtained from the Organization's headquarters: Bureau International de Métrologie Légale 11, rue Turgot Paris - France Telephone: 33 (1) and Fax: 33 (1) Telex: SVP SERV F ATTN OIML * * * This publication - reference OIML R 105, edition 1993 (E) - was developed by the OIML working groups SP 5D-Sr 10 "Mass flow assemblies for measuring quantities of liquids" and SP 5D "Dynamic measurement of quantities of liquids". It was sanctioned by the International Conference of Legal Metrology in

5 TERMINOLOGY (terms and definitions) The terminology used in this Recommendation conforms to the "Vocabulary of Basic and General Terms in Metrology" (VIM edition) and the "Vocabulary of Legal Metrology (VML edition). In addition, for the purposes of this Recommendation, the following definitions apply: T.1 Direct mass flow instrument A measuring instrument that determines the mass of a quantity of flowing liquid without the use of any auxiliary device or data on the physical properties of the liquid. T.2 Master meter A working standard, traceable to national standards, used for the verification of a direct mass flow instrument. T.3 Measuring system A direct mass flow instrument and other apparatus assembled to carry out a specified measurement operation [VIM 4.05]. T.4 Motor fuel dispenser A measuring system intended for filling the tanks of motor vehicles authorized for road traffic, pleasure boats, and small aircraft with liquid fuel. T.5 Direct sale A measuring transaction during which both the buyer and the seller (or their agents) are present when the quantity is being determined. T.6 Minimum measured quantity The smallest quantity for which the measurement is metrologically acceptable for the system. T.7 Presetting device The means used to select a quantity to be delivered and which automatically stops the flow of the liquid after the measurement and delivery of the selected quantity. T.8 Dry hose type A system in which the discharge hose is completely drained following the mechanical operation involved in each delivery. T.9 Wet hose type A system in which the discharge hose remains full of liquid prior to and after the completion of a measurement and delivery. 5

6 T.10 Maximum flow rate The highest flow rate at which the measuring system is required to meet the applicable maximum permissible errors. T.11 Minimum flow rate The lowest flow rate at which the measuring system is required to meet the applicable maximum permissible errors. T.12 Electronic measuring system A measuring system equipped with electronic devices. T.13 Electronic device T.13.1 T.13.2 T.13.3 T.13.4 T.13.5 A device employing electronic subassemblies and performing a specific function. Electronic devices are usually manufactured as a separate unit and are capable of being independently tested. Note: An electronic device, as defined above, may be a complete measuring system or part of measuring system, such as: Measuring transducer A device that transforms the flow of the liquid to be measured into signals aimed at the calculator. It may be either autonomous or use an external power source. Calculator A device that receives the output quantity from the transducer(s), checks and transforms it and, if appropriate, memorizes the results until they are used. In addition, the calculator may be capable of communicating both ways with peripheral equipment. Indicating device A device that displays the data transmitted from the calculator. Power supply A device that provides the electronic devices with the required electrical energy, using one or several sources of D.C. or A.C. Peripheral equipment Auxiliary devices such as: repeating indicating devices ticket printers daily report printers devices to read key cards, magnetic cards or bank-notes self-service equipment, etc. 6

7 T.14 Electronic subassembly A part of an electronic device employing electronic components that has a recognizable function of its own. T.15 Electronic component The smallest physical entity that uses electron or hole conduction in semiconductors, gases or in a vacuum. T.16 Error (of indication) The indication of a measuring system minus the (conventional) true value of the measure [VIM 5.24]. T.17 Intrinsic error The error of a measuring system used under reference conditions [VIM 5.27]. T.18 Initial intrinsic error T.19 Fault The intrinsic error of a measuring system as determined prior to performance tests and durability evaluations. The difference between the error of indication and the intrinsic error of a measuring system. T.20 Significant fault For masses equal to or greater than the minimum measured quantity, a fault greater than one-fifth of the absolute value of the maximum permissible error for the measured quantity. The following are not considered as significant faults: faults arising from simultaneous and mutually independent causes in the measuring instrument itself or in its checking facilities, transitory faults being momentary variations in the indication, which cannot be interpreted, memorized or transmitted as a measurement result, faults implying the impossibility to perform any measurement. T.21 Durability error The difference between the intrinsic error over a period of use and the initial intrinsic error of a measuring system. T.22 Significant durability error For masses equal to or greater than the minimum measured quantity, a durability error greater than one-fifth of the absolute value of the maximum permissible error for the measured quantity. 7

8 Durability errors are not considered as significant when: the indication cannot be interpreted, memorized or transmitted as a measurement result, the indication is such that it is impossible to perform any measurement. T.23 Interruptible/noninterruptible measuring system A measuring system is considered as interruptible/noninterruptible when the liquid flow can/cannot be stopped, easily and rapidly. T.24 Influence quantity T.24.1 T.24.2 A quantity that is not the subject of the measurement but which influences the value of the measurand or the indication of the measuring system [VIM 2.10]. Influence factor An influence quantity having a value within the rated operating conditions of the measuring system, as specified in this Recommendation. Disturbance An influence quantity having a value within the limits specified hereafter in this Recommendation, but outside the specified rated operating conditions of the measuring system. Note: An influence quantity is a disturbance if, for that influence quantity, the rated operating conditions are not specified. T.25 Rated operating conditions Conditions of use, specifying the range of values of influence quantities for which the metrological characteristics are intended to lie within the maximum permissible errors [adapted from VIM 5.05]. T.26 Reference conditions A set of specified values of influence factors fixed to ensure valid intercomparison of results of measurements [adapted from VIM 5.07]. T.27 Performance The capability of the measuring system to accomplish the intended functions. T.28 Durability The capability of the measuring system to maintain its performance characteristics over a period of use. T.29 Checking facility A facility that is incorporated in a measuring system and enables significant faults to be detected and acted upon. 8

9 Note: The checking of a transmission device aims at verifying that all information that is transmitted (and only that information) is fully received by the receiving equipment. T.30 Automatic checking facility A checking facility operating without the intervention of an operator. T.30.1 Permanent automatic checking facility (type P) An automatic checking facility operating during all the measurement operation. T.30.2 Intermittent automatic checking facility (type I) An automatic checking facility that operates at least once at the beginning of each measurement operation. T.31 Nonautomatic checking facility (type N) A checking facility that requires intervention of an operator. T.32 Durability protection feature A feature that is incorporated in a measuring system and that enables the detection of, and acting upon significant durability errors. The same classification for types P, I or N applies to durability protection features. Certain devices may be employed simultaneously, for checking and for durability protection. T.33 Performance test A test intended to verify whether the measuring system being tested (equipment under test or EUT) is capable of accomplishing its intended functions. T.34 Durability test A test intended to verify whether the EUT is capable of maintaining its performance characteristics over a period of use. 9

10 DIRECT MASS FLOW MEASURING SYSTEMS for QUANTITIES of LIQUIDS 1 Scope, application and terminology Section I GENERAL 1.1 This Recommendation specifies the metrological and technical requirements for direct mass flow measuring systems (hereafter referred to as "systems") that are designed to measure the mass of flowing liquids in closed conduits. It also specifies the relevant examination and tests that are to be conducted during pattern evaluation and verification. It does not apply to measuring systems for cryogenic liquids, for which refer to the OIML International Recommendation R The terminology given in pages 5-9 shall be considered as a part of this Recommendation. 2 Rated operating conditions Section II METROLOGICAL REQUIREMENTS The manufacturer shall specify the rated operating conditions for which the system is intended to perform within the maximum permissible errors. The rated operating conditions shall include the various liquids, or the density and viscosity ranges (including any specific product limitations) of the liquids to be measured, and the ranges of liquid flow rates, temperatures and pressures. The ratio of the maximum to minimum flow rates for the measuring system shall be: a) ten or greater for systems in general, b) five or greater for systems for liquified gases. 3 Maximum permissible errors 3.1 Pattern evaluation During pattern evaluation the maximum permissible errors on all quantities equal to or greater than two times the minimum measured quantity shall be: a) ± 0.3 % of the measured quantity under the following conditions: with any one liquid within the range of liquids, 10

11 at any one liquid temperature and pressure within their respective ranges, and at all flow rates within the range of flow rates. The system shall be adjusted for the liquid, temperature, and pressure prior to conducting the tests. b) ± 0.5 % of the measured quantity under the following conditions: with all liquids within the range of liquids, at all liquid temperatures and pressures within their respective ranges, at all flow rates within the range of flow rates. After an initial adjustment of the system, the various tests shall be conducted without further adjustment. It is recommended that the initial adjustments be made at or near mid-range of the rated operating conditions when practical. If the instrument is relocated during the testing, a consistent instrument installation that does not affect the performance of the instrument shall be maintained. 3.2 Verification The maximum permissible errors on verification shall be ± 0.5 % on all quantities equal to or greater than the minimum measured quantity under the following conditions: any one liquid, temperature, and pressure, and at any flow rate within the ranges specified for the system in the pattern approval. 3.3 Small quantities The maximum permissible error (mpe) applied to any quantity over the range from the minimum measured quantity up to two times the minimum measured quantity shall be plus or minus the absolute value of the maximum permissible error at two times the minimum measured quantity. 3.4 Repeatability The repeatability error of the instrument shall be not greater than 0.2 % of the measured quantity. Note: The repeatability error is considered to be the difference between the largest and smallest results obtained during tests conducted under the same conditions. 3.5 Liquified gases The maximum permissible errors shall be two times the maximum permissible errors specified in 3.1, 3.2, 3.3, and 3.4 when used to measure liquified gases. 4 Adjustment means A system shall be provided with means to change the ratio between the quantity indicated and the actual quantity of liquid that has passed through the system. A bypass shall not be used to this end. 11

12 4.1 Discontinuous adjusting means When the adjusting means changes the ratio in a discontinuous manner, the consecutive values of the ratio shall not differ by more than 0.1 %. 4.2 Sealing Provisions shall be made for applying a security seal to the adjustment means. 5 Minimum measured quantity 6 Indicators The minimum measured quantity of the system shall be specified by the manufacturer. Section III TECHNICAL REQUIREMENTS A measuring system shall include an indicator. Indications shall be clear, definite, accurate, and easy to read under normal conditions of operation of the instrument. 6.1 Units of measurement The indicated and recorded units for measuring systems shall be the gramme, the kilogramme, or the tonne. 6.2 Numerical value of scale interval The numerical value of a scale interval shall be equal to 1, 2, or 5, or a decimal multiple or submultiple of 1, 2, or Maximum value of scale interval The scale interval shall be not greater than 0.5 % of the minimum measured quantity. 6.4 Values defined Indicated values shall be adequately defined by a sufficient number of figures, words, symbols, or combinations thereof. A display of "zero" shall be a zero digit for all displayed digits to the right of the decimal mark and at least one to the left. Any remaining spaces to the left shall either be all "zeros" or all blank. 6.5 Return to zero Except for a noninterruptible measuring system, one indicator shall be provided with a means for returning the indication to zero either automatically or manually. 12

13 6.5.1 Resettable method of operation The resettable means shall not be operable during a delivery. Once the zeroing operation has begun, it shall not be possible to indicate a value other than the latest measurement, or "zeros" when the zeroing operation has been completed. 7 Printer 6.6 Nonresettable indicator An instrument may also be equipped with a nonresettable indicator if the indicated values cannot be construed to be the indicated values of the resettable indicator for a delivered quantity. 6.7 Presetting device An instrument may be provided with means to select the quantity to be delivered. The scale interval of the presetting device shall not be less than the scale interval of the indicator. When a system is equipped with means for printing the measured quantity, the following conditions apply: the scale interval of the printer shall be the same as that of the indicator, the value of the printed quantity shall be the same value as the indicated quantity, the printer cannot record a quantity for a delivery (other than an initial reference value) until the measurement and delivery have been completed, the printer is returned to zero when the resettable indicator is returned to zero, and the printed values shall meet the requirements applicable to the indicated values. Any delivered printed quantity shall also include an identification number, the time and date, and the name of the seller. This information may be printed by the device or preprinted on the ticket. 8 Measuring systems 8.1 Vapor elimination An instrument or measuring system shall be equipped with an effective gas elimination device or other effective means, automatic in operation, to prevent the measurement of vapor and air that results in errors greater than the applicable maximum permissible error. 8.2 Maintenance of liquid state An instrument shall be installed so that the product being measured will remain in a liquid state during passage through the instrument. 13

14 8.3 Provision for sealing Adequate provision shall be made for applying security seals in such a manner that an adjustment cannot be made on any device that affects the measurement result without breaking the security seal. 9 Discharge lines and valves 9.1 Diversion of measured liquid No means shall be provided by which any measured liquid can be diverted from the measuring instrument. However, two or more delivery outlets may be permanently installed and operated simultaneously provided that any diversion of flow to other than the intended receiving receptacle cannot be readily accomplished or is readily apparent. Such means include physical barriers, visible valves or indications that make it clear which outlets are in operation, and explanatory signs if necessary. A manually controlled outlet that may be opened for purging or draining the measuring system may be permitted. Effective means shall be provided to prevent the passage of liquid through any such outlet during normal operation of the measuring system. 9.2 Directional flow valves A valve or valves or other effective means, automatic in operation (and equipped with a pressure limiting device, if necessary), to prevent the reversal of flow shall be properly installed in the system if a reversal of flow could result in errors that exceed the maximum permissible errors. 9.3 Discharge valves A discharge valve may be installed on a discharge line only if the system is a wet hose type. Any other shutoff valve on the discharge side of the instrument shall be of the automatic or semiautomatic predetermined-stop type or shall be operable only: by means of a tool (but not a pin) entirely separate from the device, or by means of a security seal with which the valve is sealed open. 9.4 Anti-drain means In a wet hose type device, effective means shall be provided to prevent the drainage of the hose between transactions. 9.5 Other valves Check valves and closing mechanisms that are not used to define the measured quantity shall have relief valves (if necessary), to dissipate any abnormally high pressure that may arise in the measuring system. 14

15 10 Markings A measuring system shall be legibly and indelibly marked with the following information: a) pattern approval mark b) name and address of the manufacturer, or his trademark and, if required by Legal Metrology Services, the manufacturer's identification mark in addition to the trademark c) designation selected by the manufacturer d) serial number e) maximum and minimum flow rates f) maximum working pressure g) range of temperature when that of the liquid whose mass is to be measured differs from the range of - 10 C to + 50 C h) minimum measured quantity i) product limitations, if applicable. Section IV REQUIREMENTS FOR ELECTRONIC MEASURING SYSTEMS 11 General requirements for electronic measuring systems 11.1 Electronic measuring systems shall be designed and manufactured such that their errors do not exceed the maximum permissible errors under rated operating conditions Electronic measuring systems shall be designed and manufactured such that, when they are exposed to disturbances: either significant faults do not occur, or significant faults are detected and acted upon by means of checking facilities. This requirement may apply separately to: each individual cause of significant fault, and/or each part of the measuring system Noninterruptible measuring systems shall be designed and manufactured in such a way that a significant fault does not occur when they are exposed to disturbances It is the responsibility of the manufacturer to decide whether a given pattern of measuring system is interruptible or not, taking into account the applicable rules of security. A motor fuel dispenser shall be interruptible. When, at the time of pattern approval, it is not possible to specify the future utilization of the instrument, requirements in apply (see 14.1). 15

16 11.3 The requirements in 11.1 and 11.2 shall be met durably, in accordance with the following requirements: Electronic measuring systems shall be provided with the durability protection features specified in Electronic measuring systems shall be designed and manufactured such that significant durability errors resulting from causes arising in the electronic devices themselves: either do not occur, or shall be detected and acted upon by means of the durability protection features A pattern of measuring system is presumed to comply with the requirements in 11.1, 11.2 and 11.3 if it passes the examination and tests specified in Requirements specific to certain electronic devices 12.1 Measuring transducer All the signals emitted by the sensor, and only those signals, shall be transmitted securely to the calculator, for example, in the form of two similar signals, a signal with redundant information, or a signal that is verifiable by the calculator Calculator All the parameters that are necessary for the elaboration of indications that are subject to legal metrology control, such as unit price calculation table or correction polynomial shall be present in the calculator at the beginning of the measurement operation. The calculator may be provided with an interface permitting the coupling of peripheral equipment. When the external equipment is connected, the instrument shall continue to function correctly and its metrological functions shall not be affected Indicating device The unit price may be changed either on the instrument directly or through peripheral equipment. However, the instrument shall be designed such that the unit price can only be changed when the instrument is not operating. In addition, a time of at least five seconds shall elapse before the next delivery starts (starting of the pump). In the case of a direct sale, the time that elapses before an actual value appears on the indicating device shall not exceed 0.5 seconds When zeroing may be carried out before a transaction is concluded, the data relating to this transaction shall be recorded or printed on a device subject to metrological control (e.g. using a controlled memory or a secure peripheral printer or an indicator specially reserved to this end). It shall be possible to recall this data in a way that differentiates it from results of a transaction being made. 16

17 In a direct sale, no more than one transaction (in addition to the transaction being made) can be memorized for one measuring system Power supply When conducting an accuracy test to determine compliance with the requirements below, add to the maximum permissible error for the quantity indicated, 5 % of the minimum measured quantity Noninterruptible measuring systems In the case where the flow is not interrupted during the failure of the principal power supply, the measuring system shall be provided with an emergency power supply to safeguard all measuring functions occurring during that failure Interruptible measuring systems Motor fuel dispensers Either the provisions in shall be met, or the information contained at the moment of the failure shall be saved and displayable on an indicating device subject to legal metrology control as follows: either 15 minutes continuously and automatically after the failure, or 5 minutes, in one or several periods manually controlled by an appropriate device, during at least one hour after the failure. Note: This requirement is applicable when the instrument has been supplied normally with electrical power for the 12 hours that preceded the power failure. A motor fuel dispenser shall be designed such that an interrupted delivery cannot be continued after the power supply has been reestablished if the power failure has lasted more than 15 seconds Other measuring systems Either the provisions in shall be met, or the information contained at the moment of the failure shall be saved and displayable on an indicating device subject to legal metrology control when the power is returned Peripheral equipment Any peripheral device for which the main function is not to provide a definite indication for a transaction need not be submitted to control, provided it does not influence the measurement result. In such a case, a clear and unambiguous indication of this fact shall appear in the immediate vicinity of the device or on each ticket emitted. 13 Checking facilities and durability protection features Checking facilities and durability protection features are all subject to the same requirements. For ease of reading, such facilities or features are designated as checking features in this chapter. 17

18 13.1 Action of checking features The detection of significant faults or of significant durability errors by the checking features shall result in the following action, according to the type Checking feature of type N A visible or audible alarm for the attention of the operator Checking feature of types I or P a) For interruptible measuring systems, in particular motor fuel dispensers: automatic correction of the fault or error, or stopping only the faulty device when the measuring system without that device continues to comply with the regulations, or stopping the measuring system. b) For noninterruptible measuring systems: automatic correction of the fault or error, or stopping only the faulty device when the measuring system without that device continues to comply with the regulation, or a visible or audible alarm for the operator and blocking (or if possible, obliterating) the indications. This alarme shall continue until the cause of the alarm is suppressed. In addition, when the measuring system transmits data to peripheral equipment, the transmission shall be stopped or accompanied by a message indicating the presence of a fault. In addition, when an instrument is not used for a direct sale it may be provided with devices to estimate the amount of liquid having passed through the installation during the occurence of the fault or error. The result of this estimate shall not be mistaken for an indication subject to legal metrology control. c) Measuring systems shall be provided with a device permitting the retrieval of the information relating to the totalized quantity that is contained in the instrument when the significant fault or significant durability error occurred Checking feature for the indicating device (applicable for checking as defined in b) a) For motor fuel dispensers, a sequential display, for at least one second each, of all the elements ("eights" test), then blanking of all the elements ("blank" test), followed by a display of "zeros" b) For all other measuring systems, the test sequence as described under (a) or any other automatic test cycle that indicates all possible values for every element of the display Checking features for the measuring transducer The object of this checking feature is to verify the presence of the transducer, its correct operation and the correctness of data transmission. This checking feature shall be of type P and the checking shall occur at time intervals not exceeding the duration of the measurement of an amount of liquid equal to the absolute value of the maximum permissible error on the minimum measured quantity. 18

19 During initial verification it must be possible to check that this checking feature functions correctly by such means as: disconnecting the transducer disconnecting any of the transducer's signal lines interrupting one of the sensor's pulse generators interrupting the electrical supply of the transducer Checking features for the calculator The object of these checking features is to verify that the calculator system functions correctly and to ensure the validity of the calculations made. There are no special means required for showing that these checking features function correctly The checking of the functioning of the calculation system shall be of types P or I. In the latter case, the checking shall occur at least every five minutes for measuring systems other than motor fuel dispensers, and at least at each delivery for motor fuel dispensers. The object of the checking is to verify that: a) the values of all permanently memorized instructions and data are correct, by such means as: summing all instruction and data codes and comparing the sum with a fixed value line and column parity bits (LRC and VRC) cyclic redundancy check (CRC 16) double storage of data storage of data in "safe coding", for example protected by check sum, line and column parity bits b) the storage of data relevant to the measurement result is performed correctly, by such means as: write-read routine conversion and reconversion of codes use of "safe coding" (check sum, parity bit) double storage The checking of the validity of calculations shall be of type P This check consists of assessing the correct value of all the data relating to the measurement whenever these data are internally stored or transmitted to peripheral equipment through an interface; this check shall be effected by such means as parity bit, check sum or double storage. In addition, the calculation system shall be provided with a means to control the continuity of the calculation program Checking feature for the indicating device The object of this checking feature is to verify that the indications subject to legal metrology controls are displayed, and that the indications displayed correspond to the data provided by the calculator. In addition, it verifies the presence of indicating devices when they are removable. These checking features shall have either the form as defined in or the form as defined in

20 This checking feature shall be of type P, except that it may be of type I if the indication subject to legal metrology control is duplicated on the measuring system, or if it may be easily found from other indications subject to legal metrology control. For example, in the case of a motor fuel dispenser, it is possible to find the price-to-pay from the quantity and the unit price or, in other cases, when a second indication on a secure printer subject to legal metrology control may be used. The means used for checking may be: measuring the current in the filaments, for displays using incandescent filaments or LED's measuring the grid voltage, for displays using fluorescent tubes checking the impact of shutters, for displays using electro-magnetic shutters output checking of the control voltage of segment lines and of common electrodes to detect any disconnection or short-circuit between control circuits, for displays using multi-plex liquid-crystals The checking feature of the indicating device shall include: a) a type I or type P checking of the electronic circuits (except the driving circuits of the display itself) controlling the indicating device. This checking shall meet the requirements in , and b) a visual checking of the display. This checking shall meet the requirements in ("eights" test). This checking feature shall be of type I for the motor fuel dispensers and of type N for other measuring systems It shall be possible during verification to show that the checking facility of the indicating device is working, either: by disconnecting all or a part of the indicating device, or by an action that simulates a failure in the display, such as using a test-button Checking features for peripheral equipment Any peripheral equipment with indications subject to legal metrology control shall include a checking feature of type I or P. The object of this checking facility is to verify the presence of the ancillary device and to validate the data transmitted by the calculator. In particular, the checking of a printer aims at ensuring that the printing controls correspond to the data transmitted by the calculator. At least the following shall be checked: presence of paper, and the electronic control circuits (except the driving circuits of the printing mechanism itself). It shall be possible during verification to show that this checking facility of the printer is working by an action simulating a printing fault, such as using a test-button. 20

21 14 Pattern approval 14.1 Documentation The request for pattern approval shall include the following: a functional description of the operation of the measuring instrument or system a functional description of the various electronic devices a flow diagram of the logic, showing the functions of the electronic devices. Because of rapidly developing technology, a list of electronic subsystems and components as well as program listings can be given only as an indication. Replacement of electronic subassemblies or components shall not cause the performance of the electronic measuring system to deteriorate. Furthermore, the application shall be accompanied by any document or evidence that supports the assumption that the design and construction of the electronic measuring system complies with the requirements of this Recommendation, in particular clause General requirements Patterns shall normally be evaluated using one unit that is representative of the final pattern. The electronic measuring system shall be subjected to the following inspections and tests Design inspection The examination of documents aims at verifying that the design of electronic devices and their checking features complies with the provisions in , 12 and 13. It includes: a) an examination of the mode of construction and of the electronic subassemblies and components used, to verify the appropriateness for the intended use, b) considering faults that are likely to occur, to verify that in all cases these devices comply with the provisions in 13, and c) verification of the presence and effectiveness of the test device(s) for the checking features Performance tests These tests (specified in Annexes A and B) aim at verifying that the measuring system complies with the provisions in 11.1 and 11.2 for influence quantities. When subjected to the effect of an influence factor, the equipment shall continue operating correctly and shall not exceed the applicable maximum permissible errors. When subjected to an external disturbance, the equipment shall either continue operating correctly or detect and indicate the presence of any significant fault. A significant fault shall not occur on a noninterruptible measuring system Durability examination This examination aims at verifying that the measuring system complies with the provisions in as regards failures of an electronic subassembly, component, device, or connection. 21

22 When subjected to a simulated failure of an electronic subassembly, component, device, or connection, the device shall either continue to operate without a significant durability error, or detect and signal the presence of a significant durability error. The requirements in and provide sufficient assurance of durability and there is no need to carry out any durability test Equipment under test (EUT) Tests are carried out on a complete measuring system where size and configuration permit. Otherwise, electronic devices shall be submitted separately to tests in the form of equipment comprising the following devices: measuring transducer calculator indicating device power supply. This equipment shall be included in a simulation setup representative of the normal operation of the measuring system. For example, the movement of the liquid may be simulated by an appropriate device. The calculator shall be in its final housing. In all cases, peripheral equipment may be tested separately Pattern approval certificate The following information shall appear on the pattern approval certificate: name and address of the recipient of the certificate name and address of the manufacturer if other than the recipient type and/or commercial designation principle metrological and technical characteristics pattern approval mark period of validity environmental classification, if applicable (see Annex B) location of marks for pattern approval, initial verification, and sealing list of documents that accompany the pattern approval certificate any other specific remarks considered necessary. 15 Initial verification The initial verification of an electronic measuring system shall include a procedure to verify the presence and correct functioning of checking features by the use of test devices, as specified in

23 ANNEX A TEST PROCEDURES: PERFORMANCE TESTS - GENERAL These tests should be applied uniformly by the legal metrology services and are intended to ensure that the instruments can perform and function as intended in the environment and under rated conditions of use. When the effect of one factor is being evaluated, all other factors are to be held relatively constant at a value close to normal. Relatively constant or stable test conditions for each of the factors is as follows: temperature : ± 5 C pressure : ± 20 % not to exceed 200 kpa (2 bar) flow rate : ± 5 % Air buoyancy corrections shall be made as appropriate according to the equation as follows: m = f x w where: m = mass f = correction factor w = weight indicated by the weighing instrument The equation for determining the correction factor is as follows: 1 - ρ a /ρ f = r 1 - ρv /ρ where: ρ a = density of air when calibrating the weighing instrument ρ r = reference density (8 000 kg/m 3 ) ρ v = density of gas or vapor displaced when tank is filled ρ = density of liquid Note: In a closed tank (e.g. LPG), ρ v = 0 as no vapor is displaced. Table 1 provides guidelines for these corrections at standard conditions. The instrument should be tested with the liquid to be commercially measured or with a liquid of the same general physical characteristics. A.1 Pattern approval tests The gravimetric test method is recommended; other suitable methods may be used provided that the requirements in A.1.1 are met. A.1.1 Uncertainty The uncertainty (at a 95 % confidence level) in determining the error of the EUT shall not exceed 1/5 of the maximum permissible error to be applied. A.1.2 Quantities Any test quantity shall be equal to or greater than the minimum measured quantity. 23

24 A.1.3 Repeatability Tests conducted to determine compliance with 3.4 shall be conducted with quantities equal to or greater than five times the minimum measured quantity. A.1.4 Liquids The EUT should be tested with sufficient liquid or liquids with similar characteristics over the range of liquids for which the manufacturer has requested approval. A.1.5 Flow rates The EUT shall be tested at the maximum and minimum flow rates and at least four intermediate flow rates. At least three tests should be conducted at each flow rate. A.1.6 Temperatures If temperature tests are conducted, the EUT should be tested at the maximum, minimum, and at a midpoint temperature. However, the temperatures may vary from those points as follows: maximum - 10 C, minimum + 15 C, and midpoint ± 5 C. A.1.7 Durability A durability test shall be conducted as follows: an accuracy test shall be conducted prior to the durability test, the durability test shall be conducted for 100 hours in one or several periods at a flow rate from 80 % Q max to Q max, after the 100 hour test, an accuracy test shall be conducted with the same quantity as above. The test results shall not vary from the first test by more than 0.3 % of the measured quantity, without any adjustment or correction. A.1.8 Motor fuel dispensers If the EUT is intended for use as a motor fuel dispenser, an accuracy test shall be conducted with five stops and starts during a delivery at maximum flow rate. A.2 Initial and subsequent verification tests The verification of the instrument may be conducted by the gravimetric or volumetric method, or with a master meter. A.2.1 Uncertainty The uncertainty (at a 95 % confidence level) in determining the error of the EUT shall not exceed one-third of the maximum permissible error to be applied. A.2.2 Quantities Any test quantity shall be equal to or greater than the minimum measured quantity. A.2.3 Flow rates The EUT shall be tested at the maximum flow rate achievable under the conditions of installation, the minimum flow rate marked on the instrument, and at at least one intermediate flow rate. At least one test shall be conducted at each flow rate. 24

25 A.2.4 Motor fuel dispensers If the EUT is intended for use as a motor fuel dispenser, an accuracy test shall be conducted with five stops and starts during a delivery at maximum flow rate. Product density (kg/m 3 ) Table 1 Air buoyancy correction Factor (f) to

26 ANNEX B TEST PROCEDURES: PERFORMANCE TESTS APPLICABLE TO ELECTRONIC EQUIPMENT B.1 General This Annex specifies the tests intended to ensure that electronic measuring systems perform and function as intended in a specified environment and under specified conditions. Where appropriate, each test indicates the reference conditions under which the intrinsic error is determined. These tests supplement those in Annex A. When the effect of one influence quantity is being evaluated, all other influence quantities are to be held relatively constant, at values close to reference conditions. When the effect of a disturbance is being evaluated, no other dirsturbance shall be present and all influence quantities shall be held relatively constant, at values close to reference conditions. B.2 Severity levels (see OIML International Document D11) Typical test conditions are indicated for each performance test; these conditions correspond to the climatic and mechanical environment conditions to which measuring systems are usually exposed. Measuring systems are divided into three classes according to the climatic and mechanical environment conditions: Class B, for a fixed instrument installed in a building. Class C, for a fixed instrument installed outdoors. Class I, for a mobile instrument, especially that which is mounted on a truck. However, in relation to the future use of the equipment, the applicant for pattern approval may define specific environmental conditions in the documentation supplied to the metrology service. In this case, the metrology service carries out the tests at severity levels corresponding to the specific environmental conditions. If pattern approval is granted, the data plate shall indicate the corresponding limits of use, and manufacturers shall inform users of the conditions of use for which the instrument is approved. Finally, the metrology service shall verify that the conditions of use are met. B.3 Reference conditions Ambient temperature: 15 C to 25 C Relative humidity: 45 % to 75 % Atmospheric pressure: 86 kpa to 106 kpa Power voltage: Nominal voltage Power frequency: Nominal frequency During each test, the temperature and relative humidity shall not vary by more than 5 C and 10 % respectively within the reference ranges. 26

27 B.4 Performance tests TEST NATURE OF THE SEVERITY LEVEL INFLUENCE QUANTITY (reference to OIML D11) Notes: Simulated tests Except for B.4.3 and B.4.4 (nonoperational tests), the tests may be conducted by simulating the flow without any actual product passing through the measuring system if it can be shown that the flow sensor is not affected by the test conditions. Note 1: Simulated flow must produce an output or outputs from the measuring system corresponding to an actual flow rate between the minimum and maximum flow rates for the system. Note 2: While flow is being simulated, it must be possible to ascertain that the flow measurement capabilities of the system are fully operational. B.4.1 Dry heat Test method: Object of test: Dry heat (non condensing) B C I B.4.1 Dry heat Influence factor B.4.2 Cold Influence factor B.4.3 Damp heat (cyclic) Influence factor B.4.4 Vibration (sinusoidal) Influence factor 3 B.4.5 Power voltage variations Influence factor B.4.6 Short 1a 1a 1a time power & & & reductions Disturbance 1b 1b 1b B.4.7 Bursts Disturbance B.4.8 Electrostatic discharge Disturbance B.4.9 Electroma gnetic susceptibility Disturbance To verify compliance with the provisions in 11.1 under conditions of high temperature. References: IEC Publications , fourth edition, 1974, basic environmental testing procedures, Part 2: Tests, Test Bd: Dry heat, for heat dissipating equipment under test EUT with gradual change temperature. 27

28 Test procedure in brief: Background information concerning dry heat tests is given in IEC Publication , first edition, 1974, and first supplement A, 1978, Part 3: background information, section one: Cold and dry heat test. General background information on basic environmental testing procedures is given in IEC Publication 68-1, fourth edition, The test consists of exposure of the EUT to a temperature of 55 C (classes C or I) or 40 C (class B) under "free air" conditions for a two-hour period after the EUT has reached temperature stability. The EUT shall be tested at at least one flow rate (or simulated flow rate): at the reference temperature of 20 C following conditioning, at the temperature of 55 C or 40 C, two hours following temperature stabilization, and after recovery of the EUT at the reference temperature of 20 C. Test severity: 1) Temperature: severity level 2: 40 C severity level 3: 55 C Number of test cycles: 2) Duration: two hours. One cycle. Maximum allowable variations: All functions shall operate as designed. B.4.2 Cold Test method: Object of test: References: All indications shall satisfy the requirements concerning the maximum permissible errors. Cold. To verify compliance with the provisions in 11.1 under conditions of low temperature. IEC Publications , fourth edition, 1974, Basic environmental testing procedures, Part 2: Tests, test Ad: Cold, for heat dissipating EUT with gradual change of temperature. Background information concerning cold tests is given in IEC Publication , first edition 1974 and first supplement A, 1978 Part 3: Background information, section one: Cold and dry heat tests. General background information on basic environmental testing procedures is given IEC Publication 68-1, fourth edition,

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